Solutions by everydaycalculation.com
1st number: 12/30, 2nd number: 1 6/12
1230 - 1812 is -1110.
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Related: 24/30-18/12 12/30-36/12 12/60-18/12 12/30-18/24 36/30-18/12 12/30-54/12 12/90-18/12 12/30-18/36 60/30-18/12 12/30-90/12 12/30-18/60 84/30-18/12 12/30-18/84
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